Multimedia Gallery
- Topic: Timekeeping
This represents the first commercially available chip-size atomic clock.
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This clock was made by Johannes van Ceulen around 1680.
This illustration from 1766 depicts the improved escapement in Le Roy’s marine clock.
This represents the first demonstration of a tiny atomic clock.
Ferdinand Berthoud, a Swiss clockmaker serving the king of France, produced many marine clocks.
Italian astronomer Galileo Galilei competed for two longitude prizes in the 17th century.
Italian astronomer Galileo Galilei created this device to calculate the motions of Jupiter’s moons.
In 1642, for a Dutch longitude prize, Galileo proposed both an astronomical solution and an accurate sea clock—the first clock ever to have a pendulum.
This is the master clock used at the Goldstone, California, Deep Space Network station from about 1983 to 2006.